Improve admin UI for custom emojis, add copy/disable/enable (#5231)

db/migrate/20171005171936_add_disabled_to_custom_emojis.rb

@@ -0,0 +1,15 @@
+require Rails.root.join('lib', 'mastodon', 'migration_helpers')
+
+class AddDisabledToCustomEmojis < ActiveRecord::Migration[5.1]
+  include Mastodon::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  def up
+    safety_assured { add_column_with_default :custom_emojis, :disabled, :bool, default: false }
+  end
+
+  def down
+    remove_column :custom_emojis, :disabled
+  end
+end